Junction-box coupling.



E. s. M ORR ELL. JUNCTION BOX GOUPLING. APPLIOATIO-N FILED SEPT..25,1908.

Patented Mar. 23, 1909.

Q Vihwooeo EDWARD Milltltllllli, OF lIlILA DELIIlIA, PENNSYLVANIA.

JUNCTION-B OX COUPLING.

Specification of Letters Patent.

Patented March 23, 1909.

Application filed September 25, 1908. Serial No. 454,723.

To all whom it may concern:

Be 1t known that l, EDWARD S. Mormons, a citizen of the United States, residing in the city of Philadelphia, county of Philadelphia,

coupling in elevation.

and State of Pennsylvania, have invented a new and useful Junction-Box (.oupling, of which the following is a specification.

My invention relates to junction box cou e lings for electric conduit pipes, such as tlYe conduit pipes of junction or outlet boxes commonly used in the concealed electric wiring of buildings.

It is the object of my invention to provide an improved coupling for attaching conduit t pipes to outlet or junction boxes which shall e low in cost and so simple in construction.

as to make the installation or application easy and quick, with a minimum expenditure of time. I

To this end my invention-comprises the parts hereinafter described and claimed, which permit coupling of a conduit pipe-to a junction or outlet box without requiring screw threads upon either the junction box or the conduit pipe.

For an illustration of one of the forms my invention may take, reference is to be had to the accompanying drawing, in which:

Figure 1 is a top plan view, partly in section, of a junction or outlet box, the conduit pipe and coupjing being shown in horizontal section. Fig. 2 is a side elevation of a junction or-outlet .box, part of the box being shown in section with the conduit pipe and Fig. 3 is a longitudinal section of two 01 the coupling elements.

Referring to the drawing, a junction or outlet box I, of any suitable type and of any suitable shape, here shown circular by way of e ample, has a plurality oli openings 2 to receive the conduit pipes, as 3. The conduit pipe 3, shown in section in Fig. 1 and in elevation in Fig. 2, has placed over the end thereof the int'criorly smooth and extcriorl screw-threaded nipple 4 having a hexagonal: octagonal, or other shaped head 5, and an extcriorly screw-threaded shank 6, adapted to receive the interiorly screw-threaded nut 7. The nut 7 has an interior shoulder 8 and a flaring or filleted opening i), of a diameter approximatelyequal to the internal diam eter of the pipe 3. The bore of the nipple 4 tapers or llaros at H), as best seen in Fig. 3, the principal portion of the bore 11 of said nip )le being smooth and adapted. to just freey pass ovcn'the end of the exterior-ly- A- ring 12,

I smooth or non-threaded pipe 3.

)ecause of its discircu mferentially resilient,

contact with the exterior of the smooth and non-threaded pipe 3. Exteriorly, the ring 12 is also smooth but has a taper 14 adapted to enter the flare 10 of the nipple 4, as best seen in Fig.3. ",i p

In applying the coupling, the wireman or workman is not required to tln-ead the end of from stock or the market. Over this he slips the nipple 4 bringing the end of the nipple approximately to the end of the pi we 3, both pipe 3 and the nipple 4 extending t rough the opening in the wall of the junction box 1. The split ring 12 is then slipped into place and finally the not 7 is screwed up. As the out 7 advances the shoulder 8 thereof forces the ring; 12 into the flare 10 of the nipple 4. In so doing the ring 12 becomes of smaller and smaller diameter, the slot or opening 13 becomes less and less until the interim-surface of the ring 12 firmly gri s the non-threaded exterior of the pipe 3. he nut7 at the time the pipe 3 is firmly gri )ped by the ring 12, or shortly thereafter, cl amps the wall of the junction box 1 between itself and .the shoulder or head on the nipple 4, as shown in'Fi-g. 1. By this arrangement, the pipe 3 is firmly clamped to the box 1, and this without rccourse to screw threads upon the pipe 3 or upon the box 1. Y i

What Icl'aim is:

1. The combination with a nim-threaded junction box having an opening, of a nonthreaded conduit pipe, an interiorly smooth nipple upon said pipe and extending through sa1 opening, a nut adapted to advance upon said nipple, a resilient clamping member held between said nut and nipple and advanced by. said'nut to clamp said pipe, and said ,junction box being clamped between said nut'and nipple.

2. The combination with a non-threaded junction box having an opening, of a nonthreaded conduit pipe, a nipple upon said pipe and extending through said opening, said nipple and the exterior of said pipe havin; a tapering opening formed between them, a taper-nip resilient ring adapted to enter said upon said nipple to force said ring into said opening and to clampsaid pipe, and to clamp said box between said nipple and nut.

3. A coupling for attaching non-threaded the pipe 3 but uses it smooth or as it comes continuity or slot 13,. is interiorly smooth to' tapering opening, a not adapted to' advance m l v 915,990

conduit pifes to junction boxes comprisin" 10 said opening and to clamp to the pipe and apted to advance upon the screw' adapted to secure a junction box against the nigple shoulder.

in testimony whereof l lnive hereunto offixed my signature in the presence of the two subscribing witnesses.

' EDWARD S. MORRELL.

Witnesses:

ANNA Smgmnoex, DANIEL Weesinn, Jr. 

